[1914] Bailey: A Practical Method for Self-Instruction on The Ukulele (C6)
„the typical native Hawaiian instrument of diminutive guitar shape … was first produced in Hawaii about the year 1879“

[1915] Will D. Moyer: National Self Teacher for Ukulele (D6)
„The facinating (sic) instrument is very easy to· play and with a little study and practice the student will obtain Surprising results in a short time.“

[1915] A.A. Santos; Angeline F. Nunes: Original Method and Self Instructor on the Ukulele] (DGBD)¹⁾
„The ukulele was introduced into the Hawaiian Islands by Mr. M. Nunes in 1879 A. D. This little instrument made Mr. M. Nunes a favorite with His Majesty King Kalakaua, who encouraged him in the manufacture of these instruments.“

[1915] J.E. Bangerter: Making A Ukulele
Bauanleitung. „During the past two years the musical world has received a new instrument.“

[1917] E.N. Guckert: The original Guckert's Chords for the Ukulele at Sight Without Notes or Teacher (C6)
„This little instrument originated among the natives of Hawaii. It is in reality a miniature guitar. … Any simple melody can be played on it“

[1919] Will D. Moyer: Up to Date Collection of Ukulele Songs (D6)

[1919] Henry A. Bishaw: The Albert Ukulele Hawaiian Guitar Complete Instructions (D6)
„This fascinating lnstrument first became popular in Hawaii, where it was used to accompany the native Songs and Hulas, gradually finding its way to Australia, through returning tourists and finally receiving its big impetus at the time of the country-wide tour of 'The Bird of Paradise,' which had a small Hawaiian Band of UKULELE Players, under the direction of Mr. Henry A. Bishaw.“

[1921] W.J. Kamiki: The Kamiki Ukulele Method (D6)

[1931] N.N.: 5 Minute Guaranteed Ukulele Course (D6)
First published in 1927.

[1950] M. Singhi Breen: http://www.traditionalmusic.co.uk/ukulele-lady-tutor/Ukulele-lady-tutor.zip: New Ukulele Method for Beginners and Advanced Students (D6)
After download, expand with password: Traditional-Music,Co.UK. – including dots!

[1927] Ernst Hülsen: Volkstümliche Schule für die Ukulele
„The Ukulele, a kind of guitar, is a Portuguese instrument and was called Machete. Portuguese immigrants brought the instrument to Madeira, the Azores and the Sandwich Islands. The natives called it Ukulele, meaning jumping flea, and this curious name was picked up by the American inhabitants and Europeans, and it was as Ukulele that this little instrument found popularity with first the Americans and then the British, whereas as Machete, it had been a purely national folk instrument of the Portuguese.“

[1926] N.N.: The Ukulele ウクレレ独習 (D6)
One of the earliest Japanese teaching guides; tuned in D6, which is rare for Japan. „The Ukulele is Hawaii's own musical instrument and has recently become quite popular in America. For you can produce sounds very easily and accompany solo singing or popular songs or melodies. If mastered well, you can also play solo melodies, but as this instrument developed as an accompanying instrument, it is better suited [for accompaniment].“

[1932] Ida, Ichirō²⁾: Ukulele Dokushū ウクレレ独習 (C6)
„It's fun to listen to beautiful melodies with a gramophone or radio, but if you go one step further, there is nothing more fun than playing these beautiful songs yourself and singing yourself. If a popular melody is spontaneously on your tongue every day, then the ukulele is really a practical tool to accompany you carefree. As one progresses, it is not difficult to play a solo with the ukulele. Anyway, it does not take too much effort to acquire the beautiful sounds that this instrument produces. The ukulele was originally a Hawaiian instrument but has recently become extremely popular throughout America …“ (p. 1)

[1933] N.N.: Ukulele Kyōsokubon ウクレレ教則本 (D6)

[1934] Shikata, Katsuo: The Ukulele Solos (How to Playing Solo) ウクレレ独奏曲集 (C6)
Western and Hawaiian music only.

[1935] N.N.: Symphonic Ukulele Solos シンフォニックウクレレ独奏曲集 (C6)
Western and Hawaiian music only. „It has already been ten years since the lovely Ukulele came to us from far across the Pacific Ocean. I need not mention how popular the Ukulele is being played among us comrades today. But do you comrade of the Ukulele know it other than for accompaniment? I can imagine that you are not content with [only accompanying]. Therefore, let us make a further step and bring the Ukulele to life as a solo instrument.“

[1935] N.N.: Nishūkan Sokusei Ukulele Kyōhon 二週間速成ウクレレ教本 (Method for the Ukulele) (C6)

[1936] N.N.: Nishūkan Sokusei Ukulele Kyōhon 二週間速成ウクレレ教本 (Method for the Ukulele) (C6)

[1936] N.N.: Ukulele bukku: 60 Jazz Songs ウクレレブック (C6)

[1937] N.N.: Nishūkan Sokusei Ukulele Kyōhon 二週間速成ウクレレ教本 (Method for the Ukulele) (C6)}